200306902 A 7 B7 五、發明説明（1 ) 【發明所屬的技術領域】 (請先閲讀背面之注意事項再填寫本頁) 本發明關於使用於板狀被磨削材料的磨削與加工硏磨 (以下統一用“硏磨”或“硏磨等”的用語）的硏磨用砂輪 ;更詳細一點說，是關於使用在印刷電路板的硏磨等、或 者金屬板或非金屬板的硏磨等的硏磨用砂輪。 【習知技術】 在以往的技術中，在板狀被硏磨材料、特別是印刷電 路板的硏磨等中，是使用所謂的砂帶。 【發明欲解決的課題】 但是，砂帶一般來說在初期硏磨力比較充足，但容易 附著硏磨屑，並且由於硏磨層較薄，不能持續維持穩定的 硏磨力。因此，有著必須頻繁進行砂帶更換的缺點。 在硏磨印刷電路板的情況下，要求能將板狀被硏磨材 料的波動起伏、也就是所謂的具有高低起伏的被硏磨材料 均勻地硏磨，且希望能持續穩定的硏磨性能。 經濟部智慧財產局員工消費合作社印製 【發明內容】 【用以解決課題的手段】 本發明人特別硏究了在轉動砂輪中確保硏磨層圓周方 向具有某種程度的伸展性、可柔軟地硏磨、且可防止過多 的硏磨與砂輪的剝離之後，提出了在多孔性彈性體與硏磨 層間夾有1個以上的纖維含有層的構造，完成本發明。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） -5- 200306902 A7 B7 五、發明説明（2 ) (請先閲讀背面之注意事項再填寫本頁) 也就是說，本發明的硏磨用砂輪，在圓筒狀的芯材上 設置多孔性彈性體，在該多孔性彈性體外周上，設置具有 纖維的加強層，在該加強層的外周上設置硏磨層。 在上述硏磨用砂輪中，上述加強層，最好是在橡膠層 內部具有1個以上的該纖維層。上述纖維的材質可用有機 材料或無機材料。該有機材料的纖維可從芳族聚醯胺纖維 、聚酯纖維、克維拉纖維（美國D u ρ ο n t公司的聚醯胺類 纖維的商品名：Kevlar)、或尼龍纖維系列中選用。 【圖面說明】 第1圖是本發明實施形態的硏磨用砂輪的剖面圖。 第2圖是本實施型態的加強層周邊的放大圖。 第3圖是本實施型態的硏磨用砂輪的平面圖。 第4圖是顯示在實施例的硏磨試驗中所使用的試驗模 型的模式圖。 第5圖是顯示向第4圖試驗模型的被硏磨材料上的作 成模型的模式圖。 經濟部智慧財產局員工消費合作社印製 【圖號說明】 1 :芯材 2 :多孔性彈性體 3 :加強層 3 a :纖維 3 b :橡膠層 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） -6- 200306902 A7 ______ B7 五、發明説明（3 ) 4 :硏磨層 (請先閲讀背面之注意事項再填寫本頁) 【發明實施型態】 下邊參照附圖來說明本發明的一個實施型態。 第1圖，是本實施型態的硏磨用砂輪的剖面圖。在該 圖中，圖號1是圓筒狀芯材，圖號2是多孔性彈性體，圖 號3是具有纖維層的加強層，圖號4是硏磨層。 芯材1，是中空狀，作成可安裝於硏磨機的軸棒的構 造。於是，芯材1的中空部直徑與其詳細構造，要根據圖 中未顯示的硏磨機的軸棒的直徑及其構造來決定。而其長 度方向尺寸，是設計成適合被硏磨材料的大小與形狀。芯 材1的材質雖然沒有特別的限制，但最好是重量輕而且剛 性高的材質。 在芯材1的外周設置有多孔性彈性體2。多孔性彈性 體2的材料，例如是發泡性的有機多孔材質。典型的多孔 性彈性體2是海綿材料。 經濟部智慧財產局員工消費合作社印製 在多孔性彈性體2的外周上設置有加強層3。如第2 圖所示，加強層3具有由纖維3a所構成的纖維層。纖維 3a，是用來將所希望的拉伸強度施加到加強層3的構造。 藉由使這樣的加強層3中介於多孔性彈性體2與硏磨層4 之間，則可使硏磨時的砂輪保持所希望的強度與柔軟性。 加強層3，最好是在整個橡膠層3b的內部埋設纖維 3a的構造。如果藉由以橡膠層3b包覆纖維3a的構造的 話，藉由適當選擇橡膠層3b的材質或厚度，可調整硏磨 本紙張尺度適用中國國家標準（CNS ) A4規格（210乂297公釐） 200306902 A7 B7 五、發明説明（4 ) 層4的柔軟性。由於可調整柔軟性，配合被硏磨材料的材 質與硏磨等的條件，則可以持續更穩定的硏磨。 由纖維3a所構成的纖維層，可將纖維3a沿砂輪的圓 周方向捲繞來構成。在第2圖中，顯示了螺旋狀捲繞的纖 維3 a的等間隔的剖面。而纖維層的形態，不限於螺旋狀 的捲繞，也可以是編織纖維所構成的網狀。作爲典型的網 狀纖維層，可舉出用於衣料的合成纖維的織物或布料。這 種情況下，材料不僅廉價，而且取得處理也容易。 作爲纖維3a，可以使用將多根單線狀線體搓合而成 的束狀線。相對於此，在使用單線的情況下，單線的短間 隔的捲繞非常困難，做起來也費事，尤其是在硏磨中單線 切斷時會產生妨礙硏磨性與安全性的可能。因此，在本發 明中的最佳纖維狀態，是將單線搓合而成的線束。 關於纖維3 a的材質，有機材料或無機材料都行；強 調強度的話無機材料較佳；而在強調硏磨砂輪的輕量化與 柔軟性的話，有機材料較佳。這些都可根據硏磨條件作適 當選擇。 在有機材料的纖維中，可使用芳族聚醯胺纖維、聚酯 纖維、克維拉纖維（美國Du pont公司的聚醯胺類纖維的 商品名：Kevlar)、或尼龍纖維等一般纖維材料。在印刷 電路板的硏磨等過程中，與無機材料相比，重量輕、又有 柔軟性的有機材料的纖維較佳。 在硏磨層4中使用的材料，可以使用硏磨用砂輪一般 所使用的材料。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） I- - «» - :二- I - -- -I 1 -- I —^1 -- --« --- (請先閲讀背面之注意事項再填寫本頁) 訂 經濟部智慧財產局員工消費合作社印製 -8 - 200306902 A7 B7 五、發明説明（5 ) (請先閲讀背面之注意事項再填寫本頁) 在本發明中使用的磨料，一般可從氧化鋁類磨料、碳 化矽類磨料、氧化鉻類磨料、CBN磨料、與金剛石磨料 系列中選擇1種以上使用。可根據磨削條件等與被硏磨材 質來適當選擇其組合。 經濟部智慧財產局員工消費合作社印製 在本發明中所使用的結合劑，可從陶瓷結合劑、熱固 性樹脂、PVA或矽酸鹽結合劑中適當選擇。焙燒或硬化後 的組成，在使用陶瓷結合劑的情況下，氣孔率爲1 〇〜50% ，最好是15〜45% ;磨粒率爲30〜55%，最好是35〜50% 。在使用熱固樹脂結合劑的情況下，氣孔率爲〇〜20%， 最好是0〜10%，磨粒率爲20〜45%，最好是20〜40 %。 在使用PVA結合劑情況下，氣孔率爲20〜50%，最好是 30〜50%，磨粒率爲20〜45%，最好是20〜40%。在使用 氧化鎂結合劑情況下，氣孔率爲〇〜20%，最好是0〜1 0% ，磨粒率爲20〜40%，最好也是20〜40%。磨粒率越低則 硏磨性越差，如磨粒率高有産生堵塞的可能。結合劑率是 從100%減去氣孔率與磨粒率後的値。結合劑的選擇和砂 輪組成的決定，都要根據硏磨條件及被硏磨材料的材質等 來適當選擇。 第3圖顯示了硏磨層4的形態例。硏磨層4，若爲單 一的環狀的一體的硏磨層得不到相應於硏磨面的柔軟性。 因此’在硏磨層4上，例如可採用貼上複數個扇形塊型砂 輪的形態’或像第3圖所示那樣，採用貼附許多小的塊狀 磨石的形態。在硏磨層4中可以考慮各種各樣的形式，只 要可以確保硏磨層4的柔軟性，並不限定特定形式。另外 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） -9 - 200306902 A7 B7 五、發明説明（6 ) ，硏磨層4也有這樣的製作方法：在薄的橡膠層上設置磨 石片進行製作，將橡膠層捲繞貼附於加強層3的外周。 (請先閱讀背面之注意事項再填寫本頁) 上述硏磨層4的厚度，在使用C B N磨料或金剛石磨 料的情況下最好是〇 · 5 m m〜5 m m，在使用C B N磨料或金剛 石磨料以外的磨料情況下，最好是3 m m〜1 5 m m。 下面，對本發明的實施例與比較例一起進行說明，這 些並不代表著對本發明構造的任何限定。 【實施例】 硏磨層材料 磨料：綠色碳化矽磨料（GC磨料）、粒度600# 結合劑：對磨料重量比13·7 100的粉體酚醛樹脂。 硏磨層的製作順序 經濟部智慧財產局員工消費合作社印製 在將上述混合材料均勻混合後，將面積60x 240mm、 厚9mm的磨料板冷軋。經過170°C、8小時的硬化之後， 在成型的磨料板上貼附具有纖維層的橡膠層。以切斷機將 橡膠層上的硏磨層部分切斷成棋盤格狀，做成具有許多小 片磨石塊的硏磨層。再做出複數塊同樣的硏磨層。 硏磨用砂輪的製作順序 在孔徑76.2mm的酚醛樹脂層疊管上貼附海綿材料來 設置多孔質彈性層。 將磨料層貼附在其上部，將內部具有由聚酯纖維所構 本紙張尺度適用中國國家標準（CNS ) A4規格（210乂 297公犛) -10- 200306902 A7 ___ B7 五、發明説明（7 ) 成的加強層的橡膠層螺旋狀地捲繞黏接於海綿層的外周上 ’作成硏磨用砂輪。 在加強層中所使用的聚酯纖維布料，是以複數根直徑 2 0 /z m的纖維捆束爲直徑0 · 8 m m，間距0 · 7 m m編織的材料 〇 然後，進行硏磨層的加工處理，完成了外徑150mm、 長度610mm、孔徑76.2mm的硏磨用砂輪。 【比較例】 作爲比較例，準備了一般販賣的砂帶650x 200mm。 磨料爲氧化鋁類磨料（A磨料），粒度600#。 使用上述實施例與比較例的磨料，進行下述的硏磨試 I双。 作爲被硏磨材料，使用了厚度〇.6mm、尺寸510x 406mm的帶銅箔的玻璃環氧樹脂。在被硏磨材料，設置了 如下的試驗模型。如第4圖所示，作爲一個試驗模型，設 計成35mm見方內以5mm間隔設置00.3mm的孔。而後， 將這樣的模型像第5圖所示那樣印刷6行X 6列共36個。 在進行通孔電鍍之後，以網印刷機用液狀環氧樹脂進行通 孔的樹脂埋入，經150°C、2小時硬化後，在被硏磨材料 上作成試驗模型。 以下述各硏磨條件下對作成試驗模型的被硏磨材料進 行硏磨。各自進行硏磨後，檢查將試驗模型孔所埋入的樹 脂的突起去除後有無不均勻。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) ▼裝- 、11 經濟部智慧財產局員工消費合作社印製 -11 - 200306902 A7 B7 五、發明説明（8 ) 貫施例的硏磨條件 (請先閱讀背面之注意事項再填寫本頁) 砂輪尺寸：150mm (外徑）x 610mm(長度）x 76.2 mm (孔徑） 硏磨機械：印刷電路板硏磨機 砂輪轉速：2000rpm 被硏磨材料進給速度：2m/min 振蕩：470cpm 工作次數：1趟 比較例的硏磨條件 硏磨機械：帶式硏磨機 圓周速度：500m/min 被硏磨材料進給速度：2m/min 硏磨壓：+1.5〜2.0A 工作次數：2趟 經濟部智慧財產局員工消費合作社印製 爲了評價砂輪，對於孔埋樹脂的除去，對産生不均勻 狀況之前的被硏磨材料的硏磨件數、和砂輪的硏磨層消耗 完了之前的硏磨件數進行計數。對各硏磨件數的比較如下 〇 試驗結果 除去不均勻産生件數 硏磨層消耗件數 實施例 300 3000 比較例 100 100 本紙張尺度適用中國國家標準（CNS ) A4規格（210X 297公釐） -12- 200306902 A7 B7 五、發明説明（9 ) (請先閲讀背面之注意事項再填寫本頁} 從試驗結果可以看出，實施例的除去不均勻産生件數 ，與比較例的砂帶比較是其3倍。而實施例的砂輪，即使 中途産生不均勻，如對硏磨面修整仍可恢復硏磨力，可硏 磨到與不發生不均勻情況同樣的件數。對此，在砂帶中， 由於硏磨層是一層，所以硏磨不均勻産生時就是其壽命。 另外，直到硏磨層消耗盡的硏磨件數，本實施例的砂輪是 3〇〇〇件，與比較例相比是其30倍。 在砂帶中，硏磨不均勻發生後要繼續進行硏磨的話， 必須更換新的砂帶。要進行砂帶的更換作業，必須有一定 程度的砂帶庫存量。從而，與本實施例相比較，砂帶的生 産效率差很多。 【發明效果】 如上所述，本發明的硏磨用砂輪，與砂帶比較，硏磨 壽命較長，對板狀的被硏磨材料，特別是對印刷電路板的 硏磨與加工硏磨非常有效。藉此，本發明對高密度、高性 能的印刷電路板的製作是很有用的。 經濟部智慧財產局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4規格（210 乂 297公釐） -13-200306902 A 7 B7 V. Description of the invention (1) [Technical field to which the invention belongs] (Please read the precautions on the back before filling out this page) The present invention relates to the grinding and honing of plate-shaped materials to be ground ( In the following, the words "honing" or "honing" are used uniformly; honing wheels for honing; more specifically, honing for printed circuit boards, etc., or honing for metal or non-metal plates Honing wheels. [Conventional Technology] In the conventional technology, a so-called abrasive belt is used in the honing of a plate-like material to be honed, particularly a printed circuit board. [Problems to be Solved by the Invention] However, in general, abrasive belts have sufficient honing force at the initial stage, but it is easy to adhere honing debris, and since the honing layer is thin, a stable honing force cannot be maintained continuously. Therefore, there is a disadvantage that the belt must be changed frequently. In the case of honing a printed circuit board, it is required that the fluctuations of the plate-shaped honing material, that is, the honing material having high and low fluctuations, be uniformly honed, and it is desirable that the honing performance can be continuously stable. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs [Content of the Invention] [Means to Solve the Problem] The inventor has particularly studied to ensure that the circumferential direction of the honing layer has a certain degree of stretchability and can be softened by turning the grinding wheel. After honing and preventing excessive honing and peeling of the grinding wheel, a structure has been proposed in which one or more fiber-containing layers are sandwiched between the porous elastomer and the honing layer, and the present invention has been completed. This paper size applies Chinese National Standard (CNS) A4 specification (210X 297 mm) -5- 200306902 A7 B7 V. Description of the invention (2) (Please read the precautions on the back before filling this page) That is, the invention A honing grinding wheel is provided with a porous elastic body on a cylindrical core material, a reinforcing layer with fibers is provided on the outer periphery of the porous elastic body, and a honing layer is provided on the outer periphery of the reinforcing layer. In the grinding wheel for honing, the reinforcing layer preferably has one or more of the fiber layers in the rubber layer. The material of the fibers may be an organic material or an inorganic material. The fibers of the organic material may be selected from aromatic polyamide fibers, polyester fibers, Kevlar fibers (trade name of Polyamide fibers of the United States Du ρ ο t company: Kevlar), or nylon fiber series. [Description of Drawings] Fig. 1 is a sectional view of a honing grinding wheel according to an embodiment of the present invention. Fig. 2 is an enlarged view of the periphery of the reinforcing layer according to this embodiment. FIG. 3 is a plan view of a honing grinding wheel according to this embodiment. Fig. 4 is a schematic diagram showing a test model used in the honing test of the example. Fig. 5 is a schematic view showing a model created on the material to be honed to the test model shown in Fig. 4; Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs [Illustration of drawing number] 1: Core material 2: Porous elastomer 3: Reinforcement layer 3 a: Fiber 3 b: Rubber layer The paper size is applicable to Chinese National Standard (CNS) A4 specifications (210X297 mm) -6- 200306902 A7 ______ B7 V. Description of the invention (3) 4: Honing layer (please read the precautions on the back before filling out this page) [Invention implementation mode] The following describes this with reference to the drawings An embodiment of the invention. FIG. 1 is a cross-sectional view of a honing grinding wheel according to this embodiment. In the figure, figure 1 is a cylindrical core material, figure 2 is a porous elastomer, figure 3 is a reinforcing layer having a fiber layer, and figure 4 is a honing layer. The core material 1 is hollow and has a structure that can be mounted on a shaft rod of a honing machine. Therefore, the diameter of the hollow portion of the core material 1 and the detailed structure thereof are determined according to the diameter of the shaft rod of the honing machine not shown in the figure and the structure thereof. The length dimension is designed to fit the size and shape of the material being honed. Although the material of the core material 1 is not particularly limited, it is preferably a material that is lightweight and has high rigidity. A porous elastic body 2 is provided on the outer periphery of the core material 1. The material of the porous elastomer 2 is, for example, a foamable organic porous material. A typical porous elastomer 2 is a sponge material. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A reinforcing layer 3 is provided on the outer periphery of the porous elastomer 2. As shown in FIG. 2, the reinforcing layer 3 has a fiber layer composed of fibers 3 a. The fiber 3a has a structure for applying a desired tensile strength to the reinforcing layer 3. By interposing such a reinforcing layer 3 between the porous elastomer 2 and the honing layer 4, the desired strength and flexibility can be maintained in the grinding wheel during honing. The reinforcing layer 3 preferably has a structure in which fibers 3a are embedded in the entire rubber layer 3b. If the structure of the fiber 3a is covered with a rubber layer 3b, the material of the rubber layer 3b can be adjusted appropriately by honing the paper. The paper size can be adjusted to the Chinese National Standard (CNS) A4 (210 乂 297 mm). 200306902 A7 B7 V. Description of the invention (4) Softness of layer 4. The flexibility can be adjusted, and the conditions of the material to be honed and the conditions of honing can be used to maintain a more stable honing. The fiber layer composed of the fibers 3a can be formed by winding the fibers 3a in the circumferential direction of the grinding wheel. In Fig. 2, an equally spaced cross section of the spirally wound fiber 3a is shown. The form of the fibrous layer is not limited to the spiral winding, and may be a mesh made of woven fibers. As a typical mesh fiber layer, a fabric or cloth of synthetic fibers used for clothing can be mentioned. In this case, the material is not only cheap but also easy to obtain and process. As the fiber 3a, a bundle-shaped thread obtained by knitting a plurality of single-line thread bodies can be used. In contrast, when a single wire is used, it is very difficult and difficult to wind the short interval of the single wire, especially when the single wire is cut during honing, which may hinder the honing and safety. Therefore, the optimal fiber state in the present invention is a wire bundle obtained by knitting a single thread. Regarding the material of the fiber 3a, either organic or inorganic materials are acceptable; inorganic materials are preferred if the strength is emphasized; and organic materials are preferred if the weight and softness of the honing wheel are emphasized. These can be appropriately selected according to the honing conditions. Among the fibers of the organic material, general fiber materials such as aromatic polyamide fibers, polyester fibers, Kevlar fibers (Polyamide-based fibers of Du Pont Corporation of the United States: Kevlar), or nylon fibers can be used. In the process of honing and the like of a printed circuit board, fibers of an organic material that is lighter and more flexible than an inorganic material are better. As the material used for the honing layer 4, a material generally used for a honing wheel can be used. This paper size applies to Chinese National Standard (CNS) A4 (210X297 mm) I--«»-: 2-I---I 1-I — ^ 1--«--- (please Read the notes on the back and fill in this page) Order printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs-8-200306902 A7 B7 V. Description of the invention (5) (Please read the notes on the back before filling this page) In the invention Generally, one or more abrasives can be selected from alumina abrasives, silicon carbide abrasives, chromium oxide abrasives, CBN abrasives, and diamond abrasives. The combination can be appropriately selected according to the grinding conditions and the material to be honed. Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The bonding agent used in the present invention can be appropriately selected from ceramic bonding agents, thermosetting resins, PVA, or silicate bonding agents. The composition after firing or hardening, when a ceramic binder is used, the porosity is 10-50%, preferably 15-45%; the abrasive particle rate is 30-55%, preferably 35-50%. In the case of using a thermosetting resin binder, the porosity is 0 to 20%, preferably 0 to 10%, and the abrasive particle rate is 20 to 45%, preferably 20 to 40%. In the case of using a PVA binder, the porosity is 20 to 50%, preferably 30 to 50%, and the abrasive particle rate is 20 to 45%, preferably 20 to 40%. In the case of using a magnesium oxide binder, the porosity is 0 to 20%, preferably 0 to 10%, and the abrasive particle rate is 20 to 40%, preferably 20 to 40%. The lower the abrasive grain rate, the worse the honing property. If the abrasive grain rate is high, clogging may occur. Binder ratio is the ratio of 100% minus the porosity and abrasive rate. The selection of the binder and the decision of the composition of the grinding wheel must be appropriately selected according to the honing conditions and the material of the material to be honed. FIG. 3 shows an example of the form of the honing layer 4. If the honing layer 4 is a single ring-shaped integrated honing layer, the flexibility corresponding to the honing surface cannot be obtained. Therefore, "the honing layer 4 may be in the form of attaching a plurality of fan-shaped block-type wheels" or, as shown in Fig. 3, a form in which many small block-shaped grinding stones are attached. Various forms can be considered for the honing layer 4, as long as the softness of the honing layer 4 can be ensured, the specific form is not limited. In addition, this paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) -9-200306902 A7 B7 5. Description of the invention (6), the honing layer 4 also has the following production method: set on a thin rubber layer A grindstone sheet is produced, and a rubber layer is wound and attached to the outer periphery of the reinforcing layer 3. (Please read the precautions on the back before filling in this page.) The thickness of the above honing layer 4 is preferably 0.5 mm to 5 mm when using CBN or diamond abrasives. Other than using CBN or diamond abrasives In the case of abrasives, it is preferably 3 mm to 15 mm. Hereinafter, examples of the present invention will be described together with comparative examples, which do not represent any limitation on the structure of the present invention. [Example] Honing layer material Abrasive: Green silicon carbide abrasive (GC abrasive), particle size 600 # Binder: powder phenolic resin with abrasive weight ratio of 13.7 100. Honing layer production sequence Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs After the above mixed materials are uniformly mixed, the abrasive plate with an area of 60 x 240 mm and a thickness of 9 mm is cold rolled. After hardening at 170 ° C for 8 hours, a rubber layer having a fiber layer was attached to the molded abrasive plate. The honing layer on the rubber layer was cut into a checkerboard shape by a cutting machine to form a honing layer having a plurality of small stones. Then make a plurality of the same honing layer. Production procedure of honing grinding wheel A sponge material was attached to a phenol resin laminated tube having a hole diameter of 76.2 mm to provide a porous elastic layer. Attach the abrasive layer to the upper part, and have the paper size made of polyester fiber inside. Applicable to China National Standard (CNS) A4 specification (210 乂 297mm) -10- 200306902 A7 ___ B7 V. Description of the invention (7 The rubber layer of the reinforced layer is spirally wound and adhered to the outer periphery of the sponge layer to make a grinding wheel for honing. The polyester fiber cloth used in the reinforcing layer is a woven material with a plurality of fiber bundles with a diameter of 20 / zm as a diameter of 0.8 mm and a pitch of 0.7 mm. Then, the honing layer is processed. , Completed the honing wheel with an outer diameter of 150mm, a length of 610mm, and a hole diameter of 76.2mm. [Comparative Example] As a comparative example, a commercially available abrasive belt 650x200mm was prepared. The abrasive is alumina type abrasive (A abrasive) with a particle size of 600 #. Using the abrasive materials of the above Examples and Comparative Examples, the following honing tests were performed. As the material to be honed, a glass epoxy resin with a copper foil having a thickness of 0.6 mm and a size of 510 x 406 mm was used. For the material to be honed, the following test model was set. As shown in Fig. 4, as a test model, it is designed that holes of 00.3 mm are provided at 5 mm intervals within a 35 mm square. Then, as shown in Fig. 5, a total of 36 such models were printed in 6 rows and 6 columns. After the through-hole plating was performed, the resin of the through-hole was embedded with a liquid epoxy resin using a screen printer, and was cured at 150 ° C for 2 hours, and then a test model was formed on the material to be honed. The honing material used as the test model was honed under the following honing conditions. After each honing, check for unevenness after removing the protrusions of the resin embedded in the test model hole. This paper size applies to China National Standard (CNS) A4 (210X297 mm) (Please read the precautions on the back before filling out this page) ▼ Packing-， 11 Printed by the Intellectual Property Bureau of the Ministry of Economy Staff Consumer Cooperatives -11-200306902 A7 B7 V. Description of the invention (8) Honing conditions throughout the examples (please read the precautions on the back before filling this page) Grinding wheel size: 150mm (outer diameter) x 610mm (length) x 76.2 mm (aperture) Honing machine : Printed Circuit Board Honing Machine Grinding Wheel Speed: 2000rpm Feeding Speed of Honed Material: 2m / min Oscillation: 470cpm Number of Jobs: 1 Honing Condition of Comparative Example Honing Machine: Belt Honing Machine Peripheral Speed: 500m / min Feed rate of honing material: 2m / min Honing pressure: + 1.5 ~ 2.0A Work times: 2 trips Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs The number of honing parts of the material to be honed before the uniform state and the number of honing parts before the honing layer of the grinding wheel is consumed are counted. The comparison of the number of each honing piece is as follows. The test results remove the unevenness. The number of honing layer consumption. Example 300 3000 Comparative example 100 100 This paper size applies the Chinese National Standard (CNS) A4 specification (210X 297 mm) -12- 200306902 A7 B7 V. Description of the invention (9) (Please read the notes on the back before filling in this page} From the test results, it can be seen that the number of pieces produced by the removal of unevenness in the example is compared with the belt of the comparative example. It is 3 times that. Even if the grinding wheel of the embodiment has unevenness, the honing force can be restored if the honing surface is trimmed, and the number of honing can be the same as that of the non-uniformity. In the belt, since the honing layer is a layer, its life is when the honing unevenness occurs. In addition, the number of honing pieces until the honing layer is exhausted, the grinding wheel of this example is 3,000, which is the same as the comparative example. Compared to it, it is 30 times. In the abrasive belt, if the honing unevenness occurs, if the honing is continued, the new abrasive belt must be replaced. To replace the abrasive belt, there must be a certain amount of belt inventory. Thus, with this reality Compared with the examples, the production efficiency of the abrasive belt is much worse. [Effect of the Invention] As mentioned above, the honing wheel of the present invention has a longer honing life compared with the abrasive belt. It is very effective for honing and processing honing of printed circuit boards. Therefore, the present invention is very useful for the production of high-density and high-performance printed circuit boards. The paper is printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs Applicable to China National Standard (CNS) A4 specification (210 乂 297 mm) -13-